Wilcoxon’s signed rank test

Suitable non-parametric comparisons of location for paired quantitative data (sample size > 6) include Wilcoxon s signed rank test, which assumes that the distributions have similar shape. 

Statistical analysis was formed by using a commercially available computer programme (Analyse-It, Andyse-It Software Ltd, Leeds, UK). Differences between various pressures and LD blood flow values over one cycle were analysed using Student s t-test or the Wilcoxon s signed rank test depending on whether or not data were normally distributed. A difference was considered significant when p<0.05. 

Fig. 17.3 Proportion of spotted hyena pastings that were overmarks by age and sex. Males increased their overmarking activity with age (Wilcoxon signed-rank test, S = 32.5, P = 0.04), however, females did not (cub vs. subadult S = — 15.5, P = 0.24 across subadult periods N = 6, Friedman ANOVA x2 = 3.5, P = 0.17). Although male and female cubs did not differ in their frequency of overmarking (Mann-Whitney U test, U = 75, P = 0.67), a sex difference was apparent among subadults (U = 37, P = 0.02)...

Test for significance among the different treatments, using Friedman s test for related samples. The days are blocks for this test. If significant overall, examine differences between pairs of treatments by the Wilcoxon signed ranks test. Remember, the main question is whether predator odor reduces feeding. 

Chi-.square. binomial test, runs test, one-sample Kolmogorov Smirnov test. Mann-Whitney U test. Moses test. Wald-Wolfowitz test. Kruskal Wallis te.st, Wilcoxon signed rank test. Friedman s test. Kendall s W test, Cochran s Q test... 

The tests performed were the same used for the analysis of individual motivational values. The Kruskal-Wallis test and the Dunn s post-test are used for the first comparison, and the Wilcoxon signed-ranked test is used for the second comparison. 

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